mixdpy 0.2.3

MIXD format mesh handler

mixdpy

Package for handling mixd meshes and associated data

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This package provides an interface for handling the MIXD mesh format developed at CATS. Routines for reading/writing big endian binary files and a Mixd class for reading meshes and associated data are provided.

Installation

In your python environment run:

pip install mixdpy

Examples

Some examples:

Write and read binaries

import mixdpy
import numpy as np

arr = np.arange(24, dtype=np.int32).reshape(2, 3, 4)
filename = "somebinarray"

mixdpy.write_int(filename, arr, shift=False)
out = mixdpy.read_int(filename, shape=(3, 4), shift=False)

Reading a mesh

import mixdpy

path_to_mesh = "mesh"

mesh = mixdpy.Mixd(path_to_mesh, minf_name="minf.space") # Infers dpst flag from mien entries

# Read associated data
ndf = mesh.nsd + 1
ins_data_out = mesh.read_node_float("data.out",entry_shape=(ndf,))
ins_data_all = mesh.read_node_float("data.all",entry_shape=(ndf,),nts=-1)

print(mesh.get_bounds())

Export mesh using meshio

import mixdpy
import meshio

path_to_mesh = "mesh"
mesh = mixdpy.Mixd(path_to_mesh)

ndf = mesh.nsd + 1
ins_data_out = mesh.read_node_float("data.out",entry_shape=(ndf,))

export_mesh = meshio.Mesh(
    mesh.mxyz,
    {"tetra":mesh.mien}
    point_data = {
        "velocity" : ins_data_out[0,:,:mesh.nsd],
        "pressure" : ins_data_out[0,:,mesh.nsd]
    }
)
export_mesh.write("ins.vtk")